Four best friends from college are finding success as modern career women. Wang Mi Na, Yin Ge Li, Weng Mei Yan and Bai Ya Xuan are considered princesses in a tower because of their focus on their work and careers. But as they each face their own challenges of career vs. relationship, must they make a choice or can they have both?

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A scientist buried in his work to avoid the pain of his wife's death, he brings a robot home which looks just like his wife. The robot carries the burden of making her two daughters "happy". Tzu-Yu, a scientific girl who inherited her father's talent. She has not only to face the huge changes caused by her robot mother, but also the pressure of the competition. Moreover, the romance between her and the gifted transfer student Yi-Hsiu, making her sip the sweet and sour taste of growing up.